题目内容：

A T-shirt that constantly monitors the heart’s activity and detects abnormalities could help protect people against stroke. The T-shirt, which can be washed up to 35 times before it needs replacing, has been developed to improve the detection of dangerous heart conditions like atrial fibrillation( 心房颤动), which causes an irregular heart rhythm and raises the risk of stroke.

At least one million people in Britain are known to have this condition; however, it’s estimated that at least another 500,000 have it but haven’t yet been diagnosed because they have no obvious symptoms. Some will have symptoms such as chest pain, dizziness and fatigue; but a large number of people have no idea they’re ill until they suffer a stroke.

Detecting atrial fibrillation involves carrying out an ECG( 心 电 图 ). Conventional ECGs are done in a hospital and involve highly trained teams of staff attaching up to 24 separate electrodes(电极) to different parts  of  the  body to  measure electrical signals. But  most  patients experience abnormal rhythms only intermittently(间歇地). This means the chance of picking them up during a short hospital check is slim.

Doctors sometimes issue patients with a device called a Holter monitor to wear under their clothes to try to pick up cardiac( 心脏的) problems. This is an electronic box which clips onto your waistband and is connected to a series of electrodes worn on the upper part of your body. But the box itself is quite bulky, hard to hide beneath clothing and involves a dozen or more wires being attached to the patient’s chest.

The Cardioskin T-shirt, which is made from cotton, could be a much more convenient alternative and can be worn 24 hours a day — meaning it is more likely to pick up any abnormal rhythms in the patient’s heart. It has 15 tiny electrodes woven into the material which are strategically placed around the chest area to track the electrical signals from the heart as they travel across the main part of your body.

The electrodes are powered by a battery which can be removed easily when you need to wash the T- shirt and feed results to a microchip which then sends them out wirelessly to an app. This converts( 转换) the data into an easy-to-read chart showing if the heart rate is abnormal. The results are shared with the patient’s doctor so they can check the patient’s heart without having to call them into the hospital.

Martin Cowie, a professor of cardiology at Imperial College London, said, “Cardioskin could be an important development for cardiologists.”

1.How many British people are having dangerous heart conditions according to the text?

A. Less than 0.5 million.    B. Less than 1 million.

C. At least 1.5 million.    D. At least 2 million.

2.What is the main idea of Paragraph 3?

A. The difficulty in detecting atrial fibrillation.

B. The benefit of detecting atrial fibrillation.

C. The process of detecting atrial fibrillation.

D. The future of detecting atrial fibrillation.

3.Why did the author mention a Holter monitor in the text?

A. To show how convenient the Cardioskin T-shirt is.

B. To introduce a way to check the patient’s heart.

C. To encourage people to care about their health.

D. To explain why doctors like using the device.

4.What can we learn about the Cardioskin T-shirt?

A. It has a battery that can be charged easily and quickly.

B. It can be worn a month without being washed.

C. It has electrodes placed all over the T-shirt.

D. It can speed up the process of diagnosis.